一 部署 kube-proxy
kube-proxy 运行在所有节点上，它监听 apiserver 中 service 和 endpoint 的变化情况，创建路由规则以提供服务 IP 和负载均衡功能。
1.1 安装kube-proxy
提示：k8smaster01节点已下载相应二进制，可直接分发至node节点。
1.2 分发kube-proxy
1 [root@k8smaster01 ~]# cd /opt/k8s/work
2 [root@k8smaster01 work]# source /opt/k8s/bin/environment.sh
3 [root@k8smaster01 work]# for all_ip in ${ALL_IPS[@]}
4 do
5 echo ">>> ${all_ip}"
6 scp kubernetes/server/bin/kube-proxy root@${all_ip}:/opt/k8s/bin/
7 ssh root@${all_ip} "chmod +x /opt/k8s/bin/*"
8 done1.3 创建kube-scheduler证书和私钥
1 [root@k8smaster01 ~]# cd /opt/k8s/work
2 [root@k8smaster01 work]# cat > kube-proxy-csr.json <<EOF
3 {
4 "CN": "system:kube-proxy",
5 "key": {
6 "algo": "rsa",
7 "size": 2048
8 },
9 "names": [
10 {
11 "C": "CN",
12 "ST": "Shanghai",
13 "L": "Shanghai",
14 "O": "k8s",
15 "OU": "System"
16 }
17 ]
18 }
19 EOF
20 #创建kube-scheduler的CA证书请求文件解释：
- CN：指定该证书的 User 为 system:kube-proxy；
- 预定义的 RoleBinding system:node-proxier 将User system:kube-proxy 与 Role system:node-proxier 绑定，该 Role 授予了调用 kube-apiserver Proxy 相关 API 的权限；
- 该证书只会被 kube-proxy 当做 client 证书使用，所以 hosts 字段为空。
1 [root@k8smaster01 ~]# cd /opt/k8s/work 2 [root@k8smaster01 work]# cfssl gencert -ca=/opt/k8s/work/ca.pem \ 3 -ca-key=/opt/k8s/work/ca-key.pem -config=/opt/k8s/work/ca-config.json \ 4 -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy #生成CA密钥（ca-key.pem）和证书（ca.pem）
1.4 创建和分发kubeconfig
kube-proxy 使用 kubeconfig 文件访问 apiserver，该文件提供了 apiserver 地址、嵌入的 CA 证书和 kube-proxy 证书：
1 [root@k8smaster01 ~]# cd /opt/k8s/work
2 [root@k8smaster01 work]# source /opt/k8s/bin/environment.sh
3 [root@k8smaster01 work]# kubectl config set-cluster kubernetes \
4 --certificate-authority=/opt/k8s/work/ca.pem \
5 --embed-certs=true \
6 --server=${KUBE_APISERVER} \
7 --kubeconfig=kube-proxy.kubeconfig
8
9 [root@k8smaster01 work]# kubectl config set-credentials kube-proxy \
10 --client-certificate=kube-proxy.pem \
11 --client-key=kube-proxy-key.pem \
12 --embed-certs=true \
13 --kubeconfig=kube-proxy.kubeconfig
14
15 [root@k8smaster01 work]# kubectl config set-context default \
16 --cluster=kubernetes \
17 --user=kube-proxy \
18 --kubeconfig=kube-proxy.kubeconfig
19
20 [root@k8smaster01 work]# kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
21
22 [root@k8smaster01 ~]# cd /opt/k8s/work
23 [root@k8smaster01 work]# source /opt/k8s/bin/environment.sh
24 [root@k8smaster01 work]# for node_name in ${NODE_NAMES[@]}
25 do
26 echo ">>> ${node_name}"
27 scp kube-proxy.kubeconfig root@${node_name}:/etc/kubernetes/
28 done1.5 创建kube-proxy 配置文件
从 v1.10 开始，kube-proxy 部分参数可以配置文件中配置。可以使用 --write-config-to 选项生成该配置文件。
1 [root@k8smaster01 ~]# cd /opt/k8s/work
2 [root@k8smaster01 work]# cat > kube-proxy-config.yaml.template <<EOF
3 kind: KubeProxyConfiguration
4 apiVersion: kubeproxy.config.k8s.io/v1alpha1
5 clientConnection:
6 burst: 200
7 kubeconfig: "/etc/kubernetes/kube-proxy.kubeconfig"
8 qps: 100
9 bindAddress: ##ALL_IP##
10 healthzBindAddress: ##ALL_IP##:10256
11 metricsBindAddress: ##ALL_IP##:10249
12 enableProfiling: true
13 clusterCIDR: ${CLUSTER_CIDR}
14 hostnameOverride: ##ALL_NAME##
15 mode: "ipvs"
16 portRange: ""
17 kubeProxyIPTablesConfiguration:
18 masqueradeAll: false
19 kubeProxyIPVSConfiguration:
20 scheduler: rr
21 excludeCIDRs: []
22 EOF解释：
- bindAddress: 监听地址；
- clientConnection.kubeconfig: 连接 apiserver 的 kubeconfig 文件；
- clusterCIDR: kube-proxy 根据 --cluster-cidr 判断集群内部和外部流量，指定 --cluster-cidr 或 --masquerade-all 选项后 kube-proxy 才会对访问 Service IP 的请求做 SNAT；
- hostnameOverride: 参数值必须与 kubelet 的值一致，否则 kube-proxy 启动后会找不到该 Node，从而不会创建任何 ipvs 规则；
- mode: 使用 ipvs 模式。
1.6 分发配置文件
1 [root@k8smaster01 ~]# cd /opt/k8s/work
2 [root@k8smaster01 work]# source /opt/k8s/bin/environment.sh
3 [root@k8smaster01 work]# for (( i=0; i < 6; i++ ))
4 do
5 echo ">>> ${ALL_NAMES[i]}"
6 sed -e "s/##ALL_NAME##/${ALL_NAMES[i]}/" -e "s/##ALL_IP##/${ALL_IPS[i]}/" kube-proxy-config.yaml.template > kube-proxy-config-${ALL_NAMES[i]}.yaml.template
7 scp kube-proxy-config-${ALL_NAMES[i]}.yaml.template root@${ALL_NAMES[i]}:/etc/kubernetes/kube-proxy-config.yaml
8 done1.7 创建kube-proxy的systemd
1 [root@k8smaster01 ~]# cd /opt/k8s/work
2 [root@k8smaster01 work]# source /opt/k8s/bin/environment.sh
3 [root@k8smaster01 work]# cat > kube-proxy.service <<EOF
4 [Unit]
5 Description=Kubernetes Kube-Proxy Server
6 Documentation=https://github.com/GoogleCloudPlatform/kubernetes
7 After=network.target
8
9 [Service]
10 WorkingDirectory=${K8S_DIR}/kube-proxy
11 ExecStart=/opt/k8s/bin/kube-proxy \\
12 --config=/etc/kubernetes/kube-proxy-config.yaml \\
13 --logtostderr=true \\
14 --v=2
15 Restart=on-failure
16 RestartSec=5
17 LimitNOFILE=65536
18
19 [Install]
20 WantedBy=multi-user.target
21 EOF1.8 分发kube-proxy systemd
1 [root@k8smaster01 ~]# cd /opt/k8s/work
2 [root@k8smaster01 work]# source /opt/k8s/bin/environment.sh
3 [root@k8smaster01 work]# for all_name in ${ALL_NAMES[@]}
4 do
5 echo ">>> ${all_name}"
6 scp kube-proxy.service root@${all_name}:/etc/systemd/system/
7 done #分发system二 启动并验证
2.1 启动kube-proxy 服务
1 [root@k8smaster01 ~]# cd /opt/k8s/work
2 [root@k8smaster01 work]# source /opt/k8s/bin/environment.sh
3 [root@k8smaster01 work]# for all_ip in ${ALL_IPS[@]}
4 do
5 echo ">>> ${all_ip}"
6 ssh root@${all_ip} "mkdir -p ${K8S_DIR}/kube-proxy"
7 ssh root@${all_ip} "modprobe ip_vs_rr"
8 ssh root@${all_ip} "systemctl daemon-reload && systemctl enable kube-proxy && systemctl restart kube-proxy"
9 done #启动服务前必须先创建工作目录2.2 检查kube-proxy 服务
1 [root@k8smaster01 ~]# source /opt/k8s/bin/environment.sh
2 [root@k8smaster01 ~]# for all_ip in ${ALL_IPS[@]}
3 do
4 echo ">>> ${all_ip}"
5 ssh root@${all_ip} "systemctl status kube-proxy|grep Active"
6 done2.3 查看监听端口
kube-proxy 监听 10249 和 10256 端口：
- 10249：对外提供 /metrics;
- 10256：对外提供 /healthz 的访问。
1 [root@k8smaster01 ~]# cd /opt/k8s/work
2 [root@k8smaster01 work]# source /opt/k8s/bin/environment.sh
3 [root@k8smaster01 work]# for all_ip in ${ALL_IPS[@]}
4 do
5 echo ">>> ${all_ip}"
6 ssh root@${all_ip} "sudo netstat -lnpt|grep kube-prox"
7 done2.4 查看ipvs 路由规则
1 [root@k8smaster01 ~]# cd /opt/k8s/work
2 [root@k8smaster01 work]# source /opt/k8s/bin/environment.sh
3 [root@k8smaster01 work]# for all_ip in ${ALL_IPS[@]}
4 do
5 echo ">>> ${all_ip}"
6 ssh root@${all_ip} "/usr/sbin/ipvsadm -ln"
7 done可见所有通过 https 访问 K8S SVC kubernetes 的请求都转发到 kube-apiserver 节点的 6443 端口。
